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                <h1><span id="webpack4vue-cli3">webpack4+vue-cli3</span></h1><h4><span id="先使用vue-cli3创建vue项目">先使用vue-cli3创建vue项目</span></h4><h4><span id="1然后外层文件夹创建indexhtml文件里面创建一个以app为id的div标签创建build文件夹dist文件夹">1.然后外层文件夹创建index.html文件(里面创建一个以app为id的div标签)，创建build文件夹，dist文件夹</span></h4><p>文件目录：</p>
<p><img src="https://gitee.com/mo_zi_hao/picsBed/raw/master/image/clipboard0.png" alt="文件目录"></p>
<h4><span id="2安装依赖">2.安装依赖</span></h4><ol>
<li><h5><span id="安装-webpack-四件套">安装 webpack 四件套</span></h5><pre class=" language-javascript"><code class="language-javascript">npm i webpack webpack<span class="token operator">-</span>cli webpack<span class="token operator">-</span>dev<span class="token operator">-</span>server webpack<span class="token operator">-</span>merge <span class="token operator">--</span>save<span class="token operator">-</span>dev</code></pre>
</li>
<li><h5><span id="html-解析也属于基本配置-webpackbasejs">html 解析也属于基本配置     —-webpack.base.js</span></h5><pre class=" language-javascript"><code class="language-javascript">npm i html<span class="token operator">-</span>webpack<span class="token operator">-</span>plugin <span class="token operator">--</span>save<span class="token operator">-</span>dev</code></pre>
</li>
<li><h5><span id="引入vue-loader">引入vue-loader</span></h5></li>
<li><h5><span id="安装css-loader-预处理器-后处理器">安装css loader 预处理器    后处理器</span></h5><pre class=" language-javascript"><code class="language-javascript">npm i css<span class="token operator">-</span>loader style<span class="token operator">-</span>loader <span class="token operator">--</span>save<span class="token operator">-</span>dev   <span class="token comment" spellcheck="true">//css基础loader</span>
npm i less less<span class="token operator">-</span>loader <span class="token operator">--</span>save<span class="token operator">-</span>dev      <span class="token comment" spellcheck="true">//css预处理</span>
npm i node<span class="token operator">-</span>sass sass<span class="token operator">-</span>loader <span class="token operator">--</span>save<span class="token operator">-</span>dev      <span class="token comment" spellcheck="true">//css预处理 这里sass如果用npm安装失败就使用cnpm安装</span>
npm i postcss<span class="token operator">-</span>loader autoprefixer <span class="token operator">--</span>save<span class="token operator">-</span>dev   <span class="token comment" spellcheck="true">//css后处理</span></code></pre>
</li>
<li><h5><span id="安装解析图片字体等都是用-file-loader">安装解析图片，字体等都是用 file-loader</span></h5><pre class=" language-javascript"><code class="language-javascript">npm i file<span class="token operator">-</span>loader <span class="token operator">--</span>save<span class="token operator">-</span>dev</code></pre>
</li>
</ol>
<ol start="6">
<li><h5><span id="优化">优化</span></h5></li>
</ol>
<ul>
<li>解决每次重新打包，dist文件夹文件未清除</li>
</ul>
<pre class=" language-javascript"><code class="language-javascript">npm install <span class="token operator">--</span>save<span class="token operator">-</span>dev clean<span class="token operator">-</span>webpack<span class="token operator">-</span>plugin </code></pre>
<ul>
<li>分离 CSS</li>
</ul>
<pre class=" language-javascript"><code class="language-javascript">npm install <span class="token operator">--</span>save<span class="token operator">-</span>dev mini<span class="token operator">-</span>css<span class="token operator">-</span>extract<span class="token operator">-</span>plugin</code></pre>
<ul>
<li>图片压缩</li>
</ul>
<pre class=" language-javascript"><code class="language-javascript">npm install <span class="token operator">--</span>save<span class="token operator">-</span>dev image<span class="token operator">-</span>webpack<span class="token operator">-</span>loader</code></pre>
<ul>
<li>CSS压缩</li>
</ul>
<pre class=" language-javascript"><code class="language-javascript">npm install <span class="token operator">--</span>save<span class="token operator">-</span>dev optimize<span class="token operator">-</span>css<span class="token operator">-</span>assets<span class="token operator">-</span>webpack<span class="token operator">-</span>plugin</code></pre>
<h4><span id="3创建-postcssconfigjs-文件">3.创建 postcss.config.js 文件</span></h4><pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// postcss.config.js</span>
<span class="token comment" spellcheck="true">// 自动添加css兼容属性</span>
<span class="token comment" spellcheck="true">// 需要配置这个插件信息</span>
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span>
        <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'autoprefixer'</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
            overrideBrowserslist<span class="token punctuation">:</span> <span class="token punctuation">[</span>
                <span class="token string">"Android 4.1"</span><span class="token punctuation">,</span>
                <span class="token string">"iOS 7.1"</span><span class="token punctuation">,</span>
                <span class="token string">"Chrome > 31"</span><span class="token punctuation">,</span>
                <span class="token string">"ff > 31"</span><span class="token punctuation">,</span>
                <span class="token string">"ie >= 8"</span>
            <span class="token punctuation">]</span>
        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span>
    <span class="token punctuation">]</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">;</span></code></pre>
<h4><span id="4webpackbasejs">4.webpack.base.js</span></h4><pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// webpack.base.js </span>
<span class="token comment" spellcheck="true">// 存放 dev 和 prod 通用配置 </span>
<span class="token keyword">const</span> webpack <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token keyword">const</span> resolve <span class="token operator">=</span> dir <span class="token operator">=</span><span class="token operator">></span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'..'</span><span class="token punctuation">,</span>dir<span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment" spellcheck="true">//定义配置别名方法</span>
<span class="token keyword">const</span> VueLoaderPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'vue-loader/lib/plugin'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment" spellcheck="true">//***** 2.3 ***** vue-loader 插件  这里vue-cli中已经安装vue-loader vue-template-compiler，如果没有，运行命令安装： npm i vue-loader vue-template-compiler --save-dev</span>
<span class="token keyword">const</span> HtmlWebpackPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'html-webpack-plugin'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">//***** 2.2 ******  html 解析也属于基本配置</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"path"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span> 
    entry<span class="token punctuation">:</span> <span class="token string">'./src/main.js'</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//入口,</span>
    resolve<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        <span class="token comment" spellcheck="true">// 设置别名</span>
        alias<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
            <span class="token string">'@'</span><span class="token punctuation">:</span> <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'src'</span><span class="token punctuation">)</span><span class="token comment" spellcheck="true">// 这样配置后 @ 可以指向 src 目录</span>
        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span> 
    module<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span> 
        rules<span class="token punctuation">:</span> <span class="token punctuation">[</span>
          <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>    <span class="token comment" spellcheck="true">//配置vue文件    ***** 2.3 ****</span>
             test<span class="token punctuation">:</span> <span class="token regex">/\.vue$/</span><span class="token punctuation">,</span>
             loader<span class="token punctuation">:</span> <span class="token string">'vue-loader'</span>
          <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>   <span class="token comment" spellcheck="true">//配置 css预处理sass   **** 2.4 *****</span>
            test<span class="token punctuation">:</span> <span class="token regex">/\.(sa|sc|c)ss$/</span><span class="token punctuation">,</span>
            use<span class="token punctuation">:</span> <span class="token punctuation">[</span>
              <span class="token string">'style-loader'</span><span class="token punctuation">,</span>
              <span class="token string">'css-loader'</span><span class="token punctuation">,</span>
              <span class="token comment" spellcheck="true">//'postcss-loader',</span>
              <span class="token string">'sass-loader'</span><span class="token punctuation">,</span>
            <span class="token punctuation">]</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>  <span class="token comment" spellcheck="true">//配置 css预处理less   ****** 2.4 ******</span>
            test<span class="token punctuation">:</span> <span class="token regex">/\.less$/</span><span class="token punctuation">,</span>
            use<span class="token punctuation">:</span> <span class="token punctuation">[</span>
              <span class="token string">'style-loader'</span><span class="token punctuation">,</span>
              <span class="token string">'css-loader'</span><span class="token punctuation">,</span>
             <span class="token comment" spellcheck="true">// 'postcss-loader',</span>
              <span class="token string">'less-loader'</span><span class="token punctuation">,</span>
            <span class="token punctuation">]</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>  <span class="token comment" spellcheck="true">//图片配置及输出处理  ****** 2.5 ******   vue里面img应用静态图片需要引入不能直接赋予绝对路径 import imgUrl from '../assets/logo.png'   通过 :src 绑定引入的变量imgUrl</span>
            test<span class="token punctuation">:</span> <span class="token regex">/\.(png|jpe?g|gif)$/i</span><span class="token punctuation">,</span>
            loader<span class="token punctuation">:</span> <span class="token string">'file-loader'</span><span class="token punctuation">,</span>
            options<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
               limit<span class="token punctuation">:</span> <span class="token number">5000</span><span class="token punctuation">,</span>
               name<span class="token punctuation">:</span> <span class="token string">'[path][name].[ext]'</span><span class="token punctuation">,</span>  <span class="token comment" spellcheck="true">//这里将图片都打包到img文件夹</span>
               publicPath<span class="token punctuation">:</span> <span class="token string">'/'</span><span class="token punctuation">,</span>    
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
          <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span> 
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span> 
    plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span> <span class="token comment" spellcheck="true">// 插件</span>
    <span class="token comment" spellcheck="true">// 解决vender后面的hash每次都改变 </span>
     <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>HashedModuleIdsPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>

    <span class="token comment" spellcheck="true">//html 解析也属于基本配置***** 2.2 ******</span>
     <span class="token keyword">new</span> <span class="token class-name">HtmlWebpackPlugin</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      template<span class="token punctuation">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'../index.html'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>

    <span class="token comment" spellcheck="true">//***** 3 ***** vue-loader</span>
    <span class="token keyword">new</span> <span class="token class-name">VueLoaderPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
   <span class="token punctuation">]</span><span class="token punctuation">,</span> 
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">;</span></code></pre>
<h4><span id="5webpackdevjs">5.webpack.dev.js</span></h4><pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// webpack.dev.js</span>
<span class="token comment" spellcheck="true">// 存放 dev 配置</span>
<span class="token keyword">const</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>merge<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack-merge'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> common <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./webpack.base.js'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token function">merge</span><span class="token punctuation">(</span>common<span class="token punctuation">,</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
  devtool<span class="token punctuation">:</span> <span class="token string">'inline-source-map'</span><span class="token punctuation">,</span>
  devServer<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 开发服务器</span>
    contentBase<span class="token punctuation">:</span> <span class="token string">'../dist'</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
  output<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 输出</span>
    filename<span class="token punctuation">:</span> <span class="token string">'js/[name].[hash].js'</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 每次保存 hash 都变化</span>
    path<span class="token punctuation">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'../dist'</span><span class="token punctuation">)</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
  module<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span><span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
  mode<span class="token punctuation">:</span> <span class="token string">'development'</span><span class="token punctuation">,</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<h4><span id="6webpackprodjs">6.webpack.prod.js</span></h4><pre class=" language-javascript"><code class="language-javascript"><span class="token comment" spellcheck="true">// webpack.prod.js</span>
<span class="token comment" spellcheck="true">// 存放 prod 配置</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">// 合并配置文件</span>
<span class="token keyword">const</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>merge<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack-merge'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> common <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./webpack.base.js'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>CleanWebpackPlugin<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'clean-webpack-plugin'</span><span class="token punctuation">)</span>    <span class="token comment" spellcheck="true">//***** 2.6.1 **** </span>
<span class="token keyword">const</span> MiniCssExtractPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'mini-css-extract-plugin'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment" spellcheck="true">// ***** 2.6.2 ******</span>
<span class="token keyword">const</span> OptimizeCSSAssetsPlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'optimize-css-assets-webpack-plugin'</span><span class="token punctuation">)</span>   <span class="token comment" spellcheck="true">//***** 2.6.4 *****</span>

module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token function">merge</span><span class="token punctuation">(</span>common<span class="token punctuation">,</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
  module<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
       rules<span class="token punctuation">:</span> <span class="token punctuation">[</span>
            <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                test<span class="token punctuation">:</span> <span class="token regex">/\.vue$/</span><span class="token punctuation">,</span>
                loader<span class="token punctuation">:</span> <span class="token string">"vue-loader"</span><span class="token punctuation">,</span>
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>

            <span class="token comment" spellcheck="true">// css loader中的style-loader 替换为 MiniCssExtractPlugin</span>
            <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                test<span class="token punctuation">:</span> <span class="token regex">/\.(sa|sc|c)ss$/</span><span class="token punctuation">,</span>
                use<span class="token punctuation">:</span> <span class="token punctuation">[</span>
                    MiniCssExtractPlugin<span class="token punctuation">.</span>loader<span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">// ****** 2.6.2 *****</span>
                    <span class="token string">"css-loader"</span><span class="token punctuation">,</span>
                    <span class="token comment" spellcheck="true">// "postcss-loader",</span>
                    <span class="token string">"sass-loader"</span><span class="token punctuation">,</span>
                <span class="token punctuation">]</span><span class="token punctuation">,</span>
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
            <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                test<span class="token punctuation">:</span> <span class="token regex">/\.less$/</span><span class="token punctuation">,</span>
                use<span class="token punctuation">:</span> <span class="token punctuation">[</span>
                    MiniCssExtractPlugin<span class="token punctuation">.</span>loader<span class="token punctuation">,</span>    <span class="token comment" spellcheck="true">// ****** 2.6.2 *****</span>
                    <span class="token string">"css-loader"</span><span class="token punctuation">,</span>
                    <span class="token comment" spellcheck="true">// "postcss-loader",</span>
                    <span class="token string">"less-loader"</span><span class="token punctuation">,</span>
                <span class="token punctuation">]</span><span class="token punctuation">,</span>
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>

            <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                test<span class="token punctuation">:</span> <span class="token regex">/\.(png|jpe?g|gif)$/i</span><span class="token punctuation">,</span>
                use<span class="token punctuation">:</span> <span class="token punctuation">[</span>
                    <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        loader<span class="token punctuation">:</span> <span class="token string">"file-loader"</span><span class="token punctuation">,</span>
                        options<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                            limit<span class="token punctuation">:</span> <span class="token number">5000</span><span class="token punctuation">,</span>
                            name<span class="token punctuation">:</span> <span class="token string">"[path][name].[ext]"</span><span class="token punctuation">,</span>
                            publicPath<span class="token punctuation">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
                    <span class="token comment" spellcheck="true">//图片压缩   ***** 2.6.3 *****</span>
                    <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                      loader<span class="token punctuation">:</span> <span class="token string">'image-webpack-loader'</span><span class="token punctuation">,</span>
                      options<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                        mozJpeg<span class="token punctuation">:</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                          progressive<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
                          quality<span class="token punctuation">:</span> <span class="token number">65</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
                        optipng<span class="token punctuation">:</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                          enabled<span class="token punctuation">:</span> <span class="token boolean">false</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
                        pngquant<span class="token punctuation">:</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                          quality<span class="token punctuation">:</span> <span class="token string">'65-90'</span><span class="token punctuation">,</span>
                          speed<span class="token punctuation">:</span> <span class="token number">4</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
                        gifsicle<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
                          interlaced<span class="token punctuation">:</span> <span class="token boolean">false</span>
                        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
                      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
                    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
                <span class="token punctuation">]</span><span class="token punctuation">,</span>
            <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
  plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span>
    <span class="token comment" spellcheck="true">// 解决每次重新打包，dist文件夹文件未清除  ***** 2.6.1 **** </span>
    <span class="token keyword">new</span> <span class="token class-name">CleanWebpackPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token comment" spellcheck="true">//分离 CSS   ****** 2.6.2 *****</span>
    <span class="token keyword">new</span> <span class="token class-name">MiniCssExtractPlugin</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>   
      filename<span class="token punctuation">:</span> <span class="token string">'css/[name].[hash].css'</span><span class="token punctuation">,</span>
      chunkFilename<span class="token punctuation">:</span> <span class="token string">'css/[id].[hash].css'</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token comment" spellcheck="true">//CSS压缩 ***** 2.6.4 *****</span>
    <span class="token keyword">new</span> <span class="token class-name">OptimizeCSSAssetsPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">]</span><span class="token punctuation">,</span>
  mode<span class="token punctuation">:</span> <span class="token string">'production'</span><span class="token punctuation">,</span>
  output<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    filename<span class="token punctuation">:</span> <span class="token string">'js/[name].[contenthash].js'</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">//contenthash 若文件内容无变化，则contenthash 名称不变</span>
    path<span class="token punctuation">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'../dist'</span><span class="token punctuation">)</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<h4><span id="7创建-npm-命令">7.创建 npm 命令</span></h4><pre class=" language-javascript"><code class="language-javascript"><span class="token string">"scripts"</span><span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
  <span class="token string">"dev"</span><span class="token punctuation">:</span> <span class="token string">"webpack-dev-server --hot --open --config build/webpack.dev.js"</span><span class="token punctuation">,</span>
  <span class="token string">"build"</span><span class="token punctuation">:</span> <span class="token string">"webpack --config build/webpack.prod.js"</span>
<span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span></code></pre>
<p>其中dev中的–hot为热更新</p>
<p>启动项目： npm run dev</p>

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